Improvement in the manufacture of paper



dnited tate @anni comin.

Letters Patent No. 108,509, dated October 18, 1870.

IMPROVEMENT IN THE MANUFACTURE OF PAPER.

To all lwhom it may concern:

.other metallic substances frequently become inner-- porated with thepulp while the rags are being rcduccd to the state ot' the latter in therag-engine. These metallic substances are, in many instances, oxtreinelyminute, so as to be incapable of being separated by the ordinary processot' screening, and, in consequence of oxidizing, leave spots or stainsin the paper which materially reduces its commercial value.`

The object of thc present invention is to obviate this difficulty, andto this end 1 employ an 'electromagnet ora series of' electro-magnetsplaced within a box, trough, or vessel through which the liquid pulppasses, the ends or poles ol' the magnets being im mersed in the liquid,and the former being so arranged that all metallic substances containedin the pulp will be brought within the scope of the influence ot' themagnets and retained and separated from the pulp.

The accompanying drawing represents a vertical section of my invention.

A is a box, trough, or other receptacle, constructed in any propermanuel' so as to hohl a series ot electromagnets, B, which are arrangedin rows.

Only one row of two magnets is shown in the draw* ing, but in practice ldesign to have a series ot' rows with the polesot1 one row in line withthe centers of the spaces between the poles ot' the adjoining rows, sothat as thc pulp passes through the box or trough all mineral particlescontained in the pulp will bc brought within the scopc of the influenceot t-hc inagnets.

'lhe magnets are constructed of, say, half-inch round iron bent inU-form, inverted and fitted loosely in helices, U, secured betweenhorizontal bars, a, in the sides ot' the box or trough A.

By having the magnets fitted loosely in the helices the former admit ot'heilig readily removed for the purpose ot cleaning theni of pulp or anysubstance which may adhere to them and detract from their eiiciency.

The lower ends of the magnets extend down to within a short distance ofthe bottom of the box or trough, and each row ot` magnets may beconnected with a battery, or thc several rows may all be connectedtogether and one battery answer for all. I prefer, however, the formerplan. t

In the drawing the box A, in which the electromagnets are placed, ismade separate from the trough A', through which the pulp runs.

I prefer this plan, as it enables the magnets to be removed bodily andall at once out from the pulp, when necessity requires.

'lhe magnets may be drawn from the. helices when necessary by taking offthe top-piece of box A.

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with paper-making machinery an electro-magnet, or aseries ot' electro-magnets, placed within a box, trough or othersuitable receptacle through which the paper-pulp passes, for the purposeot' depriving the pulp et' iron and other mineral substances, as setforth.

2. 'lhe combination of the loose magnets with the xed helices andpaper-making machinery, substantially as and for the purpose set forth.

CHARLES E. OHAR-A.

Witnesses:

A. 1t. Harem', G. M. AGKERMAN.

